Should I suck up all of my negative view of school sports and join a team next year?

Join the swim team for sure!! I was a swimmer in high school, and I lost a lot of weight. It is great exercise. Also, not sure how it is at your school, but at mine it was an "easy" sport to join, no cuts or anything. I'm sure you won't regret it, and I'm sure you can get over your other concern about swimming too.